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                        运算符
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                        语句
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                        函数
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                        定时器
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                        DOM操作
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                        在HTML中使用JavaScript
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                        JavaScript控制样式和属性
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                        JSON相关
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<span class="hljs-tag">&lt;<span class="hljs-title">button</span> <span class="hljs-attribute">id</span>=<span class="hljs-value">&quot;btn&quot;</span>&gt;</span>&#x70B9;&#x6211;<span class="hljs-tag">&lt;/<span class="hljs-title">button</span>&gt;</span>
</code></pre>
<pre><code class="lang-css"><span class="hljs-class">.baba</span><span class="hljs-rules">{
    <span class="hljs-rule"><span class="hljs-attribute">width</span>:<span class="hljs-value"> <span class="hljs-number">200px</span></span></span>;
    <span class="hljs-rule"><span class="hljs-attribute">height</span>:<span class="hljs-value"> <span class="hljs-number">200px</span></span></span>;
    <span class="hljs-rule"><span class="hljs-attribute">background</span>:<span class="hljs-value"> skyblue</span></span>;
}</span>
<span class="hljs-class">.son1</span><span class="hljs-rules">{
    <span class="hljs-rule"><span class="hljs-attribute">width</span>:<span class="hljs-value"> <span class="hljs-number">100px</span></span></span>;
    <span class="hljs-rule"><span class="hljs-attribute">height</span>:<span class="hljs-value"> <span class="hljs-number">100px</span></span></span>;
    <span class="hljs-rule"><span class="hljs-attribute">background</span>:<span class="hljs-value"> pink</span></span>;
}</span>
</code></pre>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> baba = <span class="hljs-built_in">document</span>.querySelector(<span class="hljs-string">&quot;.baba&quot;</span>);
<span class="hljs-keyword">var</span> son1 = <span class="hljs-built_in">document</span>.querySelector(<span class="hljs-string">&quot;.son1&quot;</span>);
</code></pre>
<h2 id="attribute">attribute</h2>
<p>&#x5728;&#x884C;&#x5185;&#x6837;&#x5F0F;&#x64CD;&#x4F5C;</p>
<h3 id="getattribute&#x5C5E;&#x6027;&#x540D;">getAttribute(&#x5C5E;&#x6027;&#x540D;)</h3>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> c = son1.getAttribute(<span class="hljs-string">&quot;class&quot;</span>);
<span class="hljs-built_in">console</span>.log(c);
</code></pre>
<h3 id="setattribute&#x5C5E;&#x6027;&#x540D;&#xFF0C;&#x5C5E;&#x6027;&#x503C;">setAttribute(&#x5C5E;&#x6027;&#x540D;&#xFF0C;&#x5C5E;&#x6027;&#x503C;)</h3>
<p>&#x4E0D;&#x4EC5;&#x53EF;&#x4EE5;&#x8BBE;&#x7F6E;&#x6837;&#x5F0F;&#xFF0C;&#x8FD8;&#x53EF;&#x4EE5;&#x8BBE;&#x7F6E;&#x522B;&#x7684;&#x5C5E;&#x6027;</p>
<pre><code class="lang-javascript">baba.setAttribute(<span class="hljs-string">&quot;style&quot;</span>,<span class="hljs-string">&quot;width: 300px;&quot;</span>);

son1.setAttribute(<span class="hljs-string">&quot;id&quot;</span>,<span class="hljs-string">&quot;son1&quot;</span>);
</code></pre>
<h3 id="removeattribute&#x5C5E;&#x6027;&#x540D;">removeAttribute(&#x5C5E;&#x6027;&#x540D;)</h3>
<pre><code class="lang-javascript">son1.removeAttribute(<span class="hljs-string">&quot;id&quot;</span>);
</code></pre>
<h2 id="style&#x6837;&#x5F0F;&#x5C5E;&#x6027;">style.&#x6837;&#x5F0F;&#x5C5E;&#x6027;</h2>
<p>&#x5728;&#x884C;&#x5185;&#x6837;&#x5F0F;&#x64CD;&#x4F5C;</p>
<h3 id="&#x7528;style&#x83B7;&#x53D6;&#x6837;&#x5F0F;">&#x7528;style&#x83B7;&#x53D6;&#x6837;&#x5F0F;</h3>
<p><strong>&#x53EA;&#x80FD;&#x83B7;&#x53D6;&#x884C;&#x5185;&#x6837;&#x5F0F;</strong></p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> baba_width = baba.style.width;
<span class="hljs-built_in">console</span>.log(baba_width);
<span class="hljs-comment">//&#x5B83;&#x7684;&#x5BBD;</span>

<span class="hljs-keyword">var</span> baba_display = baba.style.display;
<span class="hljs-built_in">console</span>.log(baba_display);
<span class="hljs-comment">//&#x4EC0;&#x4E48;&#x90FD;&#x6CA1;&#x6709;</span>
</code></pre>
<h3 id="&#x8D4B;&#x503C;">&#x8D4B;&#x503C;</h3>
<pre><code class="lang-javascript">baba.style.backgroundColor = <span class="hljs-string">&quot;deepskyblue&quot;</span>;
baba.style.width = <span class="hljs-string">&quot;400px&quot;</span>;
</code></pre>
<h3 id="csstext-&#x6574;&#x4E2A;&#x6837;&#x5F0F;&#x6539;&#x52A8;">cssText &#x6574;&#x4E2A;&#x6837;&#x5F0F;&#x6539;&#x52A8;</h3>
<p><code>style.Text = &quot;&#x5C5E;&#x6027;&#x6837;&#x5F0F;:&#x5C5E;&#x6027;&#x503C;&quot;</code></p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> str = <span class="hljs-string">&quot;width:500px&quot;</span>;
baba.style.cssText = str;
</code></pre>
<h2 id="&#x6837;&#x5F0F;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF08;&#x53EA;&#x8BFB;&#xFF09;">&#x6837;&#x5F0F;&#x8BA1;&#x7B97;&#x5C5E;&#x6027;&#xFF08;&#x53EA;&#x8BFB;&#xFF09;</h2>
<p><strong>&#x6E32;&#x67D3;&#x9875;&#x9762;&#x7684;&#x7ED3;&#x679C;&#xFF0C;&#x53EA;&#x80FD;&#x83B7;&#x53D6;&#x4E0D;&#x80FD;&#x6539;&#x52A8;</strong></p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> baba_style = <span class="hljs-built_in">window</span>.getComputedStyle(baba).getPropertyValue(<span class="hljs-string">&quot;float&quot;</span>);
<span class="hljs-built_in">console</span>.log(baba_style);
</code></pre>
<h2 id="&#x63A7;&#x5236;class">&#x63A7;&#x5236;class</h2>
<h3 id="classname">className</h3>
<p>&#x5BB9;&#x6613;&#x8986;&#x76D6;&#x4E4B;&#x524D;&#x7684;&#x6570;&#x636E;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> baba_className = baba.className;
<span class="hljs-built_in">console</span>.log(baba_className);
baba.className = <span class="hljs-string">&quot;BABA&quot;</span>;
</code></pre>
<h3 id="classlist">classList</h3>
<p>&#x7C7B;&#x540D;&#x7684;&#x5217;&#x8868;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> baba_clist = baba.classList;
<span class="hljs-built_in">console</span>.log(baba_clist);
</code></pre>
<h4 id="&#x6DFB;&#x52A0;class">&#x6DFB;&#x52A0;class</h4>
<pre><code class="lang-javascript">baba_clist.add(<span class="hljs-string">&quot;mama&quot;</span>);
</code></pre>
<h4 id="&#x79FB;&#x9664;class">&#x79FB;&#x9664;class</h4>
<pre><code class="lang-javascript">baba_clist.remove(<span class="hljs-string">&quot;baba1&quot;</span>);
</code></pre>
<h4 id="&#x5224;&#x65AD;class&#x662F;&#x5426;&#x5B58;&#x5728;">&#x5224;&#x65AD;class&#x662F;&#x5426;&#x5B58;&#x5728;</h4>
<p>&#x8FD4;&#x56DE;&#x5E03;&#x5C14;&#x503C;</p>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> a = baba.classList.contains(<span class="hljs-string">&quot;baba&quot;</span>);
<span class="hljs-built_in">console</span>.log(a);
</code></pre>
<h4 id="&#x5207;&#x6362;class">&#x5207;&#x6362;class</h4>
<pre><code class="lang-javascript"><span class="hljs-keyword">var</span> ul = <span class="hljs-built_in">document</span>.getElementsByTagName(<span class="hljs-string">&quot;ul&quot;</span>);
<span class="hljs-keyword">var</span> li = <span class="hljs-built_in">document</span>.getElementsByTagName(<span class="hljs-string">&quot;li&quot;</span>);
<span class="hljs-keyword">var</span> btn = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;btn&quot;</span>);

btn.onclick = <span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
    <span class="hljs-keyword">for</span>(<span class="hljs-keyword">var</span> i=<span class="hljs-number">0</span>;i&lt;li.length;i++){
        <span class="hljs-keyword">if</span>(i%<span class="hljs-number">2</span>==<span class="hljs-number">0</span>){
            <span class="hljs-comment">//&#x5207;&#x6362;class</span>
            li[i].classList.toggle(<span class="hljs-string">&quot;baba&quot;</span>);
        }
    }
}
</code></pre>

                    
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